>> What else could cause this? > > No idea. You might have to set a different color depth in lts.conf; see > https://wiki.debian.org/DebianEdu/Documentation/Stretch/HowTo/NetworkClients#LTSP_in_detail
Hi Wolfgang, My thin clients used to work out of the box without any special configuration. Ill meditate on this. This is rather mysterious. Kind regards, Roman

